init.rc: Inidicate that booting is complete wrt firwmare requests

ueventd will wait for /dev/.booting to go away before giving up
on loading firmware.
The issue was introduced in Ifdd5dd1e95d7e064dde5c80b70198882d949a710
which forgot to update recovery's init.rc

Bug: 17993625
Change-Id: I91205fe6eea50aaef9b401d650ec8d6843a92a57

etc/init.rc

@@ -45,7 +45,6 @@ on fs
     write /sys/class/android_usb/android0/iProduct ${ro.product.model}
     write /sys/class/android_usb/android0/iSerial ${ro.serialno}
 
-
 on boot
     ifup lo
     hostname localhost
@@ -57,6 +56,9 @@ on boot
 on load_all_props_action
     load_all_props
 
+on firmware_mounts_complete
+   rm /dev/.booting
+
 # Mount filesystems and start core system services.
 on late-init
     trigger early-fs
@@ -69,6 +71,9 @@ on late-init
     # issued fs triggers have completed.
     trigger load_all_props_action
 
+    # Remove a file to wake up anything waiting for firmware
+    trigger firmware_mounts_complete
+
     trigger early-boot
     trigger boot